沪深两市10个板块全部下跌。
沪深两市波动率与交易量之间为正相关关系，且存在共同的长记忆性。
Third, the volatility and trading volume of China's stock market have a positive correlation, and there is a common long-term memory between them.
一般性数据分析结果表明沪深两市的A股月收益序列都不是一个白噪声过程；
The monthly stock indixes of A-share in two stock markets are used, the results of which indicate that monthly returns in both stock markets are not a white noise process.
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